Adjustable gauge



94 R. c. SMITH 2,357,143

ADJUSTABLE GAUG E Filed Sept. 22. 1942 4,; v 22 Hi zzl l nuentar' fiqber-t a. Smith Patented Aug. 29, 1944 2,357,143 ADJUSTABLE GAUGE Robert C. Smith, New Haven, Conn.

Application September 22, 1942, Serial No. 459,245

2 Claims.

, The present invention relates to improvements in adjustable gauges for determining whether or not items of mass production are dimensiond within predetermined tolerances. Such gauges are commonly referred to in the art as go and no-go gauges, inasmuch as they provide two pairs of complemental gauging-points between I one pair of which the item to be gauged should readily fit but not between the other complemental pair of gauging-points.

One of the objects of the present invention is to provide a simple, effective and accurate adjustable gauge of the character referred to, and which may be produced at a low cost for manufacture.

Another object of the present invention is to provide a superior adjustable gauge having two pairs of complemental gauging-points and which may be produced substantially in its entirety from plate metal and hence at low cost.

A further object of thepresent invention is to provide a superior adjustable gauge of the character referred to, which will provide adjustability over a wide range to thus permit its use for a wide variety of gauging operations.

Still another object of the present invention is to provide a superior adjustable gauge of the character referred to and so constructed and arranged as to adapt it for use either as an internal or external gauge.

With the above and other objects in View, as will appear to thos skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art. I

In the accompanying drawing, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. 1 is a face view of one form of an adjustable gauge constructed in accordance with the present invention;

I Fig. 2 is a view looking toward the lower edge thereof;

- Fig. 3 is a view looking toward edge of Fig. 1; 1

Fig. 4 is a transverse sectional viewtaken on the right-hand the line 4-4 of Fig. 1;

Fig. 5 is a detached perspective view of one of the interchangeable L-shaped gauging members detached;

Fig. 6 is-a perspective View of the plate-like body-unit;

Fig. '7 is a face view of the same character as Fig. 1, but showing a different setting of the gaugvention chosen for illustration in the accompanying drawing, include a rectangular bodyunit generally designated by the reference character I0 and comprising a rectangular bodyplate II and a longitudinal seat-rib I2.united therewith.

Both the body-plate II and the seat-rib I2 may be conveniently formed of plate steel and as is particularly .well shown in Fig. 6, the seatrib I2 extends longitudinally of the body-plate II and is located centrally intermediate its respective opposite side-edges. The said seat-rib I2 is accurately located with respect to the bodyplate I I by means of a pair of dowel pins I3I3 extending through both of theelements II. and I2 and respectivelylocated adjacent the respective opposite ends of the body-unit II]. To hold the. seat-rib I2 firmly to the body-plate II, a pair of screws I4-I4 are passed through the said seat-rib and threaded into the body-plate II.

Adjustably mounted on the body-unit III in engagement with the front-face of the body-plate I I and in engagement with the side-edges of the seat-rib I2 are four L shaped gauging-members respectively designated I5, I6, I! and I8. The said gauging-members may each be a duplicate of the others and may be conveniently formedof plate steel preferablyof a thickness corresponding to the thickness of the seat-rib I2 and suitably hardened and ground. Each gaugingmember includes a bifurcated anchoring-arm I9 extending in parallelism with and having its inner edgetightly seated against the adjacent edge of the seat-rib I2 and having a relatively-deep notch or slot I9a. Extending outwardly at a right angle from its anchoring arm I9, each gaugingmember is formed with an integral rigidgauging-arm 20 projecting beyond the adjacentsideedge of the body-plate II for purposes aswill hereinafter appear. Each gauging-arm .20 is preferably ground to provide a pair of opposite gauging-surfaces 2I and 22 extending perpendicularly to the side-edges of the seat-rib I2 and in strict parallelism with each other.

' As thus constructed and arranged, one of the four gauging-members I5, I6, I1 and I8 is located adjacent each of the four corners of the rectangular body-unit I0. I

To provide for the adjustable retention of the gauging-members-I5, I6, I] and I8 in their redetermined location on the body-unit I0, the body-plate II of the said body-unit is provided adjacent each of its four corners with one of four corresponding pairsof threaded sockets or bores 23 and 24 arranged in alignment with the notch or slot 19a in the adjacent one of the four'gaug ing-members, as is clearly'shown in Figs. 1 and 7; 3 Extendingthrough the slot I9a in the. bifurcated anchoring-arm IQ of each of the L-shaped gauging-members is a clamping-screw 25 which enters one or the other of the threaded sockets 23 or 24 in the body-plate II, in accordance with the desired setting of the gauging-members. Preferably, a relatively-heavy clamping-washer 26 is interposedbetween the under-face of the head of each of the clamping-screws 25 and the forward face of the adjacent gauging-member.

By loosening its complemental clamping-screw 25, each of the gauging-members 15, I6, I1 and I8 may be moved longitudinally with respect to the body-unit ID until the appropriate settings are secured. By way of example, the gauging-.

members l and I6 may be set so that their respective gauging-surfaces 2| and 2| are .751 apart in the event that the item to be gauged should have a nominal external size of A", with a tolerance of plus or minus .001". Under the conditions just described, the gauging-members I1 and I8 would beset so that their respective gauging-surfaces 2| and 2| are spaced .749" apart.

As thus set, the gauging-members l5 and I6 would constitute the go gauge since it would be intended that appropriately dimensioned articles of manufacture should pass between the opposed gauging-surfaces 2l-2l of the said gauging-members l5 and I6. Under these conditions, the gauging-members I! and I8 would constitute the no-go gauge, inasmuch as the properly dimensioned article of manufacture should not. pass between the opposed gaugingsurfaces 2|2l of the said gauging-members. Where suitable, the respective pairs of gaugingmembers may be set to employ their gaugingsurfaces 22-22 for gauging internal dimensions.

Should it be desired to provide a much greater gap between the gauging-surfaces 2|2I of the complemental gauging-members l5 and 16 or the complemental gauging-members l1 and is, than the gap provided by the setting shown in Fig. l, the clamping-screws 25 may be shifted from the threaded sockets 24 and into the outermost threaded sockets 23. If this setting is not adequate for the size of item to be gauged, then each gauging-member may be reversed so that its gauging-arm 20 is located on the outside of the ends of the body-unit l0.

21 and 28, illustrated in Fig. 8, may be employed.

Each of the said gauging-members 2.1 and 28 corresponds generally to the gauging-members previously described and comprises a bifurcated anchoring-arm 29 having a longitudinal slot or notch 29a therein, and a gauging-arm 30. p The respective gauging-arms 30 of the gauging memhers 21 and 28 are each provided with a cylindrically-contoured gauging-surface 3i and a flat gauging-surface 32, both extending in parallelism with each other and perpendicularly with respect to the anchoring-arm29.

With the gauging-members Zl and 28 related in the manner illustrated in Fig. 8, the cylindr'ically contoured gauging-surface 3| of each of' the said gauging-members is on the outside and may be employed for extension into a cylindrical cavity or bore to gauge the diameter thereof.

In any setting of a given pair of the complemental gauging-members, the edge portions of the'seat-rib I2 or its equivalent will serve to ensure the alignment of the said gauging-members in conjunction with the adjacent outer faceportions of the body-plate l I.

By means of the construction and arrangement of parts shown, a highly-versatile gauge is provided which lends itself to production from plate material and at a low cost as compared to most gauges now in use.

The invention may be carried out in other specific Ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim:

1. An adjustable gauge including in combination: a relatively-wide body-plate; a relativelynarrow seat-rib located on one face of the said body-plate intermediate the respective opposite side-edges thereof so as to leave a portion of the face of the said body-plate adjacent each sideedge of the said seat-rib exposed for engagement by a pair of gauging-members; a pair of L-shaped gauging-members constructed and arranged to be mounted on either of the respective opposite sides of the said seat-rib and each gauging-member including an anchoring-arm having its inner edge sea ed against one edge of the said seat-rib and having one of its faces bearing against the face of the said body-plate adjacent the said seat-rib, each of the said L-shaped gauging-members also .ng a gauging-arm extending substantially perpendicularly from its complemental anchorin mm and projecting outwardly beyond the adjacent side-edge of the said body-plate; and clamping-means adjustably holding the said gau ing-members against the said body-plate and against the said seat-rib.

- 2. An adjustable gauge including in combination: a relatively-wide body-plate; a relativelynarrow seat-rib located on one face of the said body-plate intermediate the respective opposite side-edges thereof so as to leave a portion of the face of the said body-plate adjacent each sideedgeof the said seat-rib exposed for engagement by a pair of gauging-members; a pair of L-shaped gauging-members constructed and arranged to be mounted on either of the respective opposite sides of the said seat-rib and each gauging-member including a slotted anchoring-arm having its inner edge seated against one edge of the said seat-rib and having one of its faces bearing against the face of the saidbody-plate adjacent the seat-rib. each of the said L-shap'ed gauging-members also including gauging-arm extending substantially perpendicularly from its complemental anchoring-arm and projecting outwardly beyond the adjacent side-edge of the said body-plate; and clamping-screws respectively extending through the slotted anchoring-arm of one of the said gauging-members to hold the same" against the said body-plate and against the said seat-rib.

ROBERT C. SMITH; 

